# Statisrics with C++.
//Program to calculate the QUARTILE of given grouped data.
#include<iostream.h>
#include<iomanip.h>
#include<conio.h>
const SZ=100;
class Quart
{
public : int F[SZ],LCF[SZ],LM[SZ],UL[SZ];
int Tn,h,N;
public : void QData();
void QShow();
void Quartile(int);
};
void Quart :: QData()
{
cout<<"\nEnter total no. data : ";
cin>>Tn;
cout<<"\n\nEnter lower and upper limit of class: (ex. 0 10) : \n";
for(int i=0;i<Tn;i++)
{
cout<<"\n Class Number"<<i+1<<" : ";
cin>>LM[i];
cin>>UL[i];
}
cout<<"\n\nEnter frequency for entered classes : \n";
for(i=0;i<Tn;i++)
{
cout<<"\n Freq. for class "<<LM[i]<<"-"<<UL[i]<<" : ";
cin>>F[i];
LCF[i] = F[i];
}
for(i=1;i<Tn;i++)
{
LCF[i]=LCF[i-1]+LCF[i];
}
}
void Quart :: QShow()
{
cout<<"\n\nYour Data : \n\n";
cout<<"\nTotalNumbr of Data : "<<Tn;
cout<<"\n\n Class \t Frequency\t less than c. freq.\n";
for(int i=0;i<Tn;i++)
{ cout<<"\n "<<LM[i]<<"-"<<UL[i]<<"\t\t"<<F[i]<<"\t\t"<<LCF[i]; }
}
void Quart :: Quartile(int a)
{
int c,d,l,u,f,i=0;
N=LCF[Tn-1];
float mdc=(float)(N*a)/4;
while(i<Tn)
{
if(LCF[i]>mdc)
{
d=LCF[i];
c=LCF[i-1];
f=F[i];
l=LM[i];
u=UL[i];
h=u-l;
break;
}
i++;
}
cout<<"\n\n";
/*
( These are to check the values which we are going to put in the quartile formulae... )
cout<<"\nClass Interval (i.e h) = "<<h;
cout<<"\nSum of all Freq.s (i.e N) = "<<N;
cout<<"\nTo find median class ((N*a)/4) = "<<mdc;
cout<<"\nFrequency of median class (f)= "<<f;
cout<<"\nLower limit of median class (l)= "<<l;
cout<<"\nUpper limit of median class (u)= "<<u;
cout<<"\nLess-than-cf just before the ltcf of median class (i.e C) = "<<c;
cout<<"\n\nMedian Class : \n\n";
cout<<"\n-----------------------------------\n";
cout<<"\n Class \t Frequency \t Less than CF.\n";
cout<<"\n "<<l<<"-"<<u<<"\t\t"<<f<<"\t\t "<<d ;
cout<<"\n------------------------------------\n";
*/
float QT =(float) (l+(h*(mdc-c)/f));
cout<<" = "<<setprecision(2)<<QT<<"\n";
}
void main()
{
Quart q;
clrscr();
q.QData();
clrscr();
q.QShow();
cout<<"\n\nFirst Quartile = Q1 ";
q.Quartile(1);
cout<<"\nSecond Quartile= Q2 ";
q.Quartile(2);
cout<<"\nThird Quartile = Q3 ";
q.Quartile(3);
getche();
}
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OUTPUT :
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Please comment if there is any error or corrections...
Happy Coding!
